Diff: main.cpp

Revision:

0:e45bbd4486df

diff -r 000000000000 -r e45bbd4486df main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Jan 18 01:27:57 2011 +0000
@@ -0,0 +1,36 @@
+
+#include "mbed.h"
+#include "iomacros.h"
+
+DigitalOut led1(LED1);
+Serial pc(USBTX, USBRX);
+
+// The two main functions, call one or the other
+// depending on P20, one Mbed or the other.
+void tx(Serial *, DigitalOut *);
+void rx(Serial *, DigitalOut *);
+
+int main() {
+
+    p20_AS_INPUT;
+    p20_MODE(PIN_PULLUP);
+    
+    pc.baud(115200);
+    
+    if (p20_IS_SET) tx(&pc, &led1); // This is the sending Mbed that creates the waveforms
+    else            rx(&pc, &led1); // This is the receiving Mbed that tries to read it.
+    
+    // Note, I used two Mbeds. I could just use one but I didn't want the
+    // software creating the waveforms to steal CPU time. I wanted the receiver
+    // to have all available CPU time it needed. End result, no where enough
+    // with a software soluttion and the SSP failed totally by missing the first bit.
+    
+    // With the software solution I did manage to read the data but only to about
+    // 500kHz. The Mbed libs are known to be slow so I could have tried using direct
+    // peripheral usage. But I know from experience that even doing that I would prob
+    // get upto about maybe 1.5MHz. No where near the 6.5MHz needed to read the 
+    // AD9951 DSP serial output. Shame on Maxim for having a, err, dumb ass serial
+    // protocol!
+
+    
+}